Base addresses and system.h #define

[Altera_Forum]

I have an SOPC system with some custom components and 2 Altera PIO components. I am trying to write to a PIO using this function, for example: 

 IOWR(PIO_0_BASE, 3, 0x0); // Clear edge capture register  However, I get a compile error saying that PIO_0_BASE is undeclared, even though i am doing a# include "system.h" at the top of my code. Isn&#39;t that the preferred way to access components in the system?  My code will work if I copy this file from system.h into my code: # define PIO_0_BASE 0x00010800  But that defeats the purpose of having all the registers defined in one place! I was under the impression (from reading the niow SW dev manual) that you don&#39;t normally have to explicity# include system.h. anyway.  Any ideas on what I&#39;m doing wrong? I&#39;m relatively new to C AND the Nios so this may be a C newbie error or a Nios newbie error. http://forum.niosforum.com/work2/style_emoticons/<#EMO_DIR#>/smile.gif

[Altera_Forum]

Look at the software templates/examples. Any that need base addresses, always# include "system.h". 

 What&#39;s more, for the PIO, you&#39;ll probably want to be including altera_avalon_pio_regs.h.  Cheers,  - slacker

[Altera_Forum]

Thanks, slacker. 

 Including system.h AND altera_avalon_pio_regs.h worked.    --- Quote Start ---  originally posted by slacker@Mar 22 2007, 11:03 AM look at the software templates/examples.  any that need base addresses, always# include "system.h".  what&#39;s more, for the pio, you&#39;ll probably want to be including altera_avalon_pio_regs.h.  cheers,  - slacker <div align='right'><{post_snapback}> (index.php?act=findpost&pid=22429)  --- quote end ---    --- Quote End ---